#6377AC
Closest named color: Off Blue (#5684AE). oklch(57.5% 0.086 267.9), rgb(99, 119, 172).
Aa
Black text reads best on this color (4.76:1).
About this color
#6377AC is a medium-dark, moderately saturated blue. In OKLCH its lightness is 58%, its chroma 0.086 and its hue 268°. Its hue sits on the cool side of the wheel. The nearest named color is Off Blue (#5684AE), ΔE 0.038 away. Black text reads best on it, at 4.76:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.086) |
| Temperature | cool |
| Nearest name | Off Blue (#5684AE) |
| Black text | 4.76:1 |
| White text | 4.40:1 |
Values
| HEX | #6377AC |
| RGB | rgb(99, 119, 172) |
| HSL | hsl(224, 31%, 53%) |
| OKLCH | oklch(57.5% 0.086 267.9) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #6377AC | 4.40:1 | AA large text | Lc -76.0 | Fine for body text |
| Black text on #6377AC | 4.76:1 | AA | Lc 33.6 | Non-text elements, placeholder text |
| #6377AC text on white | 4.40:1 | AA large text | Lc 70.5 | Content text, not long reading |
| #6377AC text on black | 4.76:1 | AA | Lc -31.2 | Non-text elements, placeholder text |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 600.
-
Step 50
50
#F4F5F9
oklch(97.1% 0.005 275)
-
Step 100
100
#E6EAF2
oklch(93.6% 0.012 264.5)
-
Step 200
200
#D3D9E8
oklch(88.5% 0.022 268.4)
-
Step 300
300
#B6C0DA
oklch(80.8% 0.038 268.8)
-
Step 400
400
#90A0C8
oklch(70.7% 0.061 267.8)
-
Step 500
500
#7588BA
oklch(63.1% 0.079 268.1)
-
Step 600
600 (this color)
#6377AC
oklch(57.5% 0.086 267.9)
-
Step 700
700
#4D5F8E
oklch(49.1% 0.079 267.5)
-
Step 800
800
#3F4D73
oklch(42.5% 0.066 268.1)
-
Step 900
900
#36415D
oklch(37.8% 0.05 267.5)
-
Step 950
950
#1F2637
oklch(27% 0.033 266.9)
#6377AC with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #647CAE | 0.014 |
| Deuteranopia (no green cones) | #5D75AB | 0.010 |
| Tritanopia (no blue cones) | #4A828A | 0.077 |
| Achromatopsia (no color) | #787878 | 0.086 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6377AC
#6377AC
oklch(57.5% 0.086 267.9)
- #8E7639
#8E7639
oklch(57.6% 0.085 88.1)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #6377AC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Off Blue #5684AE ΔE 0.038
- Stormy Blue #507B9C ΔE 0.039
- Steel Blue #4682B4 ΔE 0.040
- Dull Blue #49759C ΔE 0.042
- Cool Blue #4984B8 ΔE 0.042
- Dusty Blue #5A86AD ΔE 0.043
- Cerulean #457B9D ΔE 0.046
- Flat Blue #3C73A8 ΔE 0.048
Use #6377AC in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.